ARTCC radar controller clears aircraft X at FL370 to FL330 and has a conflict with air carrier Y at ...

Attributes
ACN	418335
Time
Date	199810
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dqn
State Reference	OH
Altitude	msl bound lower : 35000 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid tower : fxe
Operator	general aviation : personal
Make Model Name	Sabreliner 265
Operating Under FAR Part	Part 91
Navigation In Use	Other
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : developmental
ASRS Report	418335
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 9 controller radar : 6
ASRS Report	418920
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	faa : investigated
Miss Distance	horizontal : 13800 vertical : 900
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft X northbound needed descent into ptk. I had to keep at FL370 to clear wbound FL350 traffic. Clearing traffic, I descended aircraft X to FL330. Initial rate of descent and heading showed I would have lateral separation with wbound FL350 traffic. After issuing other clrncs, a re-evaluation showed I would not have lateral on both sides. I issued turns to both aircraft. Wbound aircraft at FL350 reported responding to TCASII alert. When traffic was clear, I issued headings to join on course. Winds report on center computer were reported to be out of northwest, we were out of south in this situation.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR CLRS ACFT X AT FL370 TO FL330 AND HAS A CONFLICT WITH ACR Y AT FL350.

Narrative: ACFT X NBOUND NEEDED DSCNT INTO PTK. I HAD TO KEEP AT FL370 TO CLR WBOUND FL350 TFC. CLRING TFC, I DSNDED ACFT X TO FL330. INITIAL RATE OF DSCNT AND HDG SHOWED I WOULD HAVE LATERAL SEPARATION WITH WBOUND FL350 TFC. AFTER ISSUING OTHER CLRNCS, A RE-EVALUATION SHOWED I WOULD NOT HAVE LATERAL ON BOTH SIDES. I ISSUED TURNS TO BOTH ACFT. WBOUND ACFT AT FL350 RPTED RESPONDING TO TCASII ALERT. WHEN TFC WAS CLR, I ISSUED HDGS TO JOIN ON COURSE. WINDS RPT ON CTR COMPUTER WERE RPTED TO BE OUT OF NW, WE WERE OUT OF S IN THIS SIT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

ARTCC radar controller clears aircraft X at FL370 to FL330 and has a conflict with air carrier Y at FL350.